Final answer:
B. false.
The claim that Andrew Carnegie's company was called United States Steel Corporation is false. Carnegie founded the Carnegie Steel Factory and only after selling it to J. P. Morgan was the United States Steel Corporation established.
Step-by-step explanation:
The statement that Andrew Carnegie's company was called United States Steel Corporation is false. Carnegie rose from modest beginnings to dominate the steel industry in the United States. He founded the Carnegie Steel Factory, which utilized the Bessemer Process to produce stronger and cheaper steel. By 1900, Carnegie's business had eclipsed Great Britain's steel production.
He achieved this through a strategy of vertical integration, owning all parts of the production process, from raw materials to distribution. However, it was after Carnegie sold his company to J. P. Morgan that the United States Steel Corporation was formed. Morgan consolidated Carnegie's holdings with other firms to create this new entity, which became the world's largest corporation at the time.